Aggregation and counter ion binding ability of sulfonatomethylcalix[4]resorcinarenes in aqueous solutions

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• 作者：Amirov ; R.R. ; Nugaeva ; Z.T. ; Mustafina ; A.R. ; Fedorenko ; S.V. ; Morozov ; V.I. ; Kazakova ; E.Kh. ; et. al.
• 关键词：Water-soluble calix[4]resorcinarene ; Lanthanide ion ; Inclusion ; Self-assembly
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2004
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：June 15, 2004
• 卷：240
• 期：1-3
• 页码：35-43
• 文件大小：248 K

摘要

<SUP>1H NMR spectroscopy, ¹H NMR spin-lattice relaxation, conductivity and pH-metric titration data have been used to study the aggregation and counter-ion binding of tetrasulfonatomethylcalix[4]resorcinarenes with methyl (H<sub>8sub>XNa<sub>4sub>) and amyl (H<sub>8sub>YNa<sub>4sub>) substituents. The data obtained reveal the self-aggregation of H<sub>8sub>YNa<sub>4sub> driven by hydrophobic interactions. The NMR relaxation data indicate that Gd³⁺ is bound by both H<sub>8sub>XNa<sub>4sub> and H<sub>8sub>YNa<sub>4sub>. The Gd³⁺ ions were found to induce the aggregation of H<sub>8sub>YNa<sub>4sub> with critical association concentration (CAC) value less than in case of its self-aggregation. Using Gd³⁺ as a probe of counter-ion binding with the aggregate interface it was found out that binding of quaternary ammonium cations (QUATSs) with H<sub>8sub>YNa<sub>4sub> aggregates and SDS aggregates is quite different, while binding of inorganic ions by both types of aggregates is similar. The most outstanding peculiarity of QUATSs binding with H<sub>8sub>YNa<sub>4sub> aggregates is selective recognition of QUATSs, possessing trimethylammonium group, detected by NMR relaxation method.